Getting Incorrect answer?

#1

I have done the code for Fast fibonacci which accepted same code I copied here and use ans=fib(r+2)-fib(l+1).Getting WA.Please review my code.Link:- https://ide.codingblocks.com/s/238074

#2

@rishravi937
I saw the wrong question
Sorry buddy
While giving output do ((x-y)%mod+mod)%mod

#3

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